a survey conducted by the american automobile association showed that a family of four spends an average of $215.60 per day while on vacation. suppose a sample of 64 families of four vacationing at niagara falls resulted in a sample mean of $252.45 per day and a sample standard deviation of $77.00. br br a. develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting niagara falls (to 2 decimals).br br div